Perhaps you should try some spelling variations:
nhanh thanh » phan thanh, nhanh tinh
hanh hanh » hanh han, xanh hanh, thanh thanh
tang van » dang van, hoang van, trong van
su sach » so sach, vu sach
doi cua » dai cua, hoi cua
hieu ve » hieu va, hieu van
mang xa » lang xa, mang may, dang xay
cua tre » cua te, cuu tre, cua triet
ve am » va am
thuc » thu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((mang xa) or (tang van)) hoi. hieu ve am thuc ((hanh hanh) OR (nhanh thanh)) doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((mang xa) OR (tang van)) hoi. hieu ve am thuc ((hanh hanh) OR (nhanh thanh)) doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((mang xa) or (tang van)) hoi. hieu ve am thuc ((hanh hanh) OR (nhanh thanh)) doi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y ((mang xa) or (tang van)) hoi. hieu ve am thuc ((hanh hanh) OR (nhanh thanh)) doi cua tre*.